In my lasts office(very busy arch vis)and every other office I worked in,?the client sends the drawings, which we examine them and return a quote. Your not going to get anything else. If you think otherwise don’t do Archvis. That’s how it typically works. Sometimes if your lucky a 3D model is hidden somewhere in all the drawings(this is way more common nowadays). The model is usually incomplete and useless but sometimes a good reference. Either way glad I’m not doing vis anymore but good luck as it sounds like a nice project.